Electric control device for linotype machines



Nov. 8, 1938. R. v. STREETER 2,135,919

ELECTRIC CONTROL DEVICE ECR LINCTYPE MACHINES' Filed Jan. .2l. 1938 2Sheets-Sheet l Nov. 8, 1938. R. v. sTRl-:ETER

ELECTRIC CONTROL DEVICE FOR LINOTYPE MACHINES 2 sheets-sheet 2 PatentedNov. 8, 1938 ELECTRIC CONTROL DEVICE FOR LINOTYPE MACHINES Ralph V.Streeter, Minneapolis, Minn.

Application January 21, 1938, Serial No. 186,136

12 Claims.

My invention relates to mechanism for lifting the assembling elevatorsof type-casting machines and particularly to power-operated,electrically controlled elevator-lifting apparatus.

In the usual conventional forms of type-casting machines such as theLinotype machine, the assembling elevators are lifted by application ofmuscular effort on a manually operated lifting lever. With such machinesthe manually operated lifting lever constitutes an undesirableobstruction and operation thereof'causes fatigue of the operator.

It is an object of my invention to provide a power-operated mechanismfor lifting the assembling elevato-r of a type-casting machine.

Ano-ther object is to provide such a mechanisrn wherein application oflifting effort may be initiated by manipulation of an easily operatedmanual control element and automatically terminated at the pro-per pointin the cycle of operation of the type-casting machine.

Still another object is toprovide such a mechanism of an electricallycontrollable nature.

A further object is to provide such mechanism of light, compact, simple,inexpensive, easilyv installed and easily operated construction.

These and other objects and'advantages of the invention will more fullyappear in the following description made in connection with theaccompanying drawings, in which like reference characters refer tosimilar parts throughout the several views, and, in which:-

Fig. l is a front view of a portion of a typecasting machine having anembodiment of my invention incorporated therein;

Fig. 2 is a sectional view taken along the line 2 2 of Fig. 1 asindicated by the arrows;

Fig. 3 is a side View of my mechanism to enlarged scale and disposed asin Fig. 2;

Fig. Il is a front view;

Fig. 5 is a side view of my mechanism as viewed from a directionopposite that of Figs. 2 and 3; and

Fig. 6 is an electrical connection diagram of the control circuit of mymechanism.

Referring to the drawings, an embodiment of my invention is shownassociated with a Linotype type-casting machine L having a key vboard 1,a vertically movable assembling elevator 8, a camroll shaft 9, and aline delivery shaft III. An assembling elevator lever handle II ismounted on an assembling elevator lever shaft I2, which carries anassembling elevator lever I3 connected to the assembling elevator 8through a link I4. The assembling elevator 8 in the conventional machineis raised by depressing the handle II, and returns to its normal loweredposition responsive to the pull of gravity when the handle II isreleased. When the assembling elevator 8 has been raised to itsupper-most limit of movement the line delivery shaft lll rotates in acounter-clockwise direction through a moderate angle as the typematrices are removed from the assembling elevator 8. When the linedelivery shaft IIl has rotated in a counter-clockwise direction througha suitable angle, the handle I I may be released to permit theassembling elevator 8 to drop responsive to the pull of gravity. Thecamroll shaft 9 rotates continuously while the machine L is in use insuch direction that the upper side thereof, as viewed in Fig. l, movesrearwardly; that is the shaft 9 rotates in a counterclockwise directionwhen viewed from a direction corresponding to. the direction from whichthe machine L is viewed in Fig. 2. To partially counterbalance theweight of the assembling elevator `8 a helical tension spring I5 isconnected between a lug I3b formed on the hub I3a of the assemblingelevator lever I3 and an anchoring pin I6 mounted on a suitable portionof the machine L. All of the above mentioned parts of the machine L areconstructed in accordance with conventional practice.

In accordance with my invention I provide a frame consisting of a plateI'i disposed in a vertical plane parallel to the front of the machine Land having a leftwardly projecting extension I'Ia through whichapertures I'Ibare formed. The frame plate II is mounted on the machine Lin a suitable location by means of screws IB passing through theapertures I'Ib and screwthreadedly anchored in suitable internallyscrewthreaded apertured portions of the machine L. Forwardly projectingmembers I9 and 20 are formed on the plate Il and have journalled inapertures therein an operating shaft 2l disposed to the left of andco-axiall'y of the cam-roll shaft 9 of the machine L.

Electromagnetically controlled friction clutch means is providedVbetween the cam-roll shaft 9 and the operating shaft 2`I. For thispurpose a disk '22 formed of magnetic material is mounted on theVleft-hand end of the camroll shaft 9 by means of a hub 22a formed onthe disk 22 and securedon the shaft 'Sjby means 'of a set screw 22h. For.cooperation with the magnetic disk 22 an electromagneticcore 23 isprovided on the right-hand end of the operating shaft 2l. The core 23includes a pair of pole pieces 23a and 23h, both disposed eccentricallyrelative to the axis of vthe sha'ftJZl andhaving free ends disposedclosely adjacent the face of the disk 22. An electromagnetic winding isprovided for the purposeof magnetically energizing the pole pieces23aand 232). This electromagnetic winding-"may'consist of a coil24'mounted on the pole piece'23b. Obviously energization of the coil 24Kwill magnetically energize the pole pieces 23a and 23h. The polepieces23a and 23h willbe attracted to the disk 22 andvthroughpurposelypermitted end play of the operating shaft 2| will shift-into engagementwith and adhere tothe disk 22 so as to'be in frictional engagementtherewith to produce transmission of rotary mechanical power from thecam-roll shaft '9 to the operating shaft 2|.

Means operated by the operating shaft 2| is provided for applyinglifting effort to the assembling elevator 8 and this elevator liftingmechanism may be constructed as follows: A secondary shaft 25 disposedon an axis parallel `to and vertically spaced from the axis of theoperating shaft 2| is provided. 'I'he secondary shaft 25 is journalledin suitable apertured projections 26 and 21 formed on the frame plate I1near the lower extremity thereof. A sprocket 28 is frictionally mountedon the operating shaft 2| and a sprocket 29 is mounted on the secondaryshaft 25. An endless sprocket chain 30 is trained over the respectivesprockets 28 and 29. Obviously when the operating shaft 2| is drivenfrom the cam-roll shaft 9 the forwardmost run of the chain 33 will moveupwardly. A member 3| secured at its upper end to the assemblingelevator 8 is connected in its lower portion to the forward or upwardlymovable run of the chain 30. The member 3| may consist of a barextending downwardly from the assembling elevator 8, as shown in Fig. 2,to a level below the lower sprocket 29, then extending rearwardly, thenextending upwardly to a point somewhat above the lower sprocket 29, andthen extending rearwardly. The last mentioned rearwardly extendingportion 3|a of the member 3| may be formed into an element adapted to beengaged in one of the open spaces of the chain 30, as indicated in Fig.3. It should be apparent that rotation of the operating shaft 2| bypower delivered thereto from the shaft 9 will result in the assemblingelevator 8 having lifting effort applied thereto. When this liftingeffort has been lapplied for a sufficient length of time to enable theassembling elevator 8 to reach its upper limit of movement, the shaft 2|will be forced to slip relative to the sprocket 28 but will maintain atorsional force on the sprocket 28 so as to hold the assembling elevatorat its upper limit of movement. If the electromagnetic coil 24 besubsequently de-energized the above mentioned torsional force will beremoved and the assembling elevator 8 will descend responsive to thepull of gravity and Vin descending will return the chain 30 to itsnormal position.

Means is provided for transmitting electrical energy to the coil 24which, as previously pointed out, rotates with the operating shaft 2|.For this purpose an annular current collector or slipring 32concentrically mounted on a wheel 32a formed of electrical insulatingmaterial is provided. The slip-ring 32 is connected to one end of thecoil 24, and the other end of the coil 24 is connected to the magneticcore 23 so as to be grounded to the frame plate |1 through the operatingshaft 2| and the members I9 in which ,the shaft 2| is journalled. Thewheel 32a carrying the slip-ring 432 is `i'noun'tel on 'the shaft 2|between the projecting member 20 and the magnetic core 23. A generally.horizontally disposed plate 33 formed of insulating material isdisposed with its medial portion above the slipring 32. The rear end ofthe'plate 33 is swingably attached as by means of a hinge 33a to theupper end of the plate. |1 so that the plate 33 of insulating materialis vertically shiftable relative to the slip-ring 32. An electricalcontact element 34 is secured to the lower side of the medial portion ofthe insulating plate 33 in such Vposition as to rest upon the uppermostportion of the slip-ring 32 when the plate 33 is held downwardly by theforce of gravity. The electrical contact element 34 is adapted to beconnected to one terminal of a suitable source of electrical energy, theother terminal of which may be connected to the plate |1. With suchconnections it should be apparent that lifting the insulating plate 33will cause de-energization of the coil 24 and that the coil 24 may beenergized by permitting the plate 33 to be lowered responsive to thepull of gravity.

Means is provided for normally maintaining the insulating plate 33 in araised position thereof to maintain the coil 24 in de-energizedcondition. For this purpose a bracket 35 is mounted on and projectsupwardly from the plate 33. The upper end 35a of the bracket 35 projectsforwardly to constitute a stop element. A moderate distance below theshaft 2| a forwardly projecting bracket 36 is formed on the plate |1. Agenerally vertically extending dog 31 is pivotally connected at itslower end to the free end of the arm 36 so that the dog 31 is swingableforwardly and rearwardly. The upper end of the dog 31 is adapted toengage a lower side of the stop element 35a when the insulating plate 33is in its raised position so as to maintain the insulating plate 33 inits raised position. In order to yieldably keep the dog 31 in engagementwith the stop element 35a, a helical tension spring 38, shown in Fig. 5,is connected between the medial portion of the dog 31 and an anchoringelement 38a mounted on the insulating plate 33 at a suitable pointthereon. To assist gravity in maintaining a downward force on theinsulating plate 33 a helical tension spring 39 is connectedv betweenthe insulating plate 33 and the rigid arm 36 situated therebelow.

Remotely controllable means is provided for shifting the dog 31 out ofengagement with the stop element 35a to permit downward movement of theinsulating plate .33 and consequent energization of the coil 24. Forthis purpose a U- shaped magnetic core 40 is disposed at the side of thedog 31 opposite the bracket 35 with the pole faces of the core 40 facingthe forward side of the dog 31. The dog 31 is, of course, constructedAof magnetic material. The core 40 is secured to the forward end portionof the insulating plate 33. For energization of the core 40 anelectromagnetic coil 24 is mounted on the upper leg thereof. Obviouslyenergization of the coil 4| will result in the dog 31 being attracted bythe core 40 and pulled out of engagement with the stop element 35a.

An electrical connection diagram of an electrical circuit for use inconnection with the electromagnetic coils 24 and 4| is shown in Fig. 6,A suitable source of electrical energy such as the battery B isprovided. One terminal of the battery B may be connected to the frameplate |1 and will be connected therethrough to one end of the winding ofthe coil 24. One end of the winding of the coil 4I should also beconnected by suitable means to the frame I'I. The ungrounded terminal ofthe battery B may be connected to one terminal of a switch 42 which maybe mounted, as shown in Figs. Vl and 2, in a suitable convenientlocation adjacent the keyboard 'I of the machine L. The remainingterminal of the switch 42 is connected to the contact element 34 carriedby the insulating plate 33 so that the coil 24 will be energized bylowering of the plate 33 and deenergized responsive to the raising ofthe plate 33. The above mentioned remaining terminal of the switch 42may be connected to thevremaining terminal of the coil 4I through a keyswitch 43, which maybe mounted in a suitable convenient location closelyadjacent the keyboard as indicated in vFigsrl and 2. Momentary closureof the key 43'by an operator of the machine L will cause momentaryenergization of the coil 4I to pull the dog 3l out of engagement withthe stop element 35a. The plate 33 will then drop to cause energizationof the coil 24 as previously described. Energization of the coil 24 willcause establishment of a frictional driving connection between the shaft9 and the operating shaft 2| so as to cause lifting effort to be appliedto the assembling elevator 8, whereupon the assembling elevator 8 willrise. When the assembling elevator 8 has reached its upper limit ofmovement, the coil 24 will still be energized, and accordingly atorsional force will be maintained on the sprocket 28 to hold theassembling elevator 8 at its upper limit of movement.

Means is provided for causing de-energization of the coil 24 when theline delivery shaft has effected a suitable part of itscounter-clockwise angular displacement occurring responsive to theassembling elevator reaching its upper limit of movement. An arm 44 isprovided on the forward end of the line delivery shaft I0 and normallyprojects therefrom to the right and somewhat downwardly. A verticallyextending push rod 45 has a screw threaded lower portion 45a, extendingthrough a suitable aperture in the free end portion -of the arm 44.Adjusting nuts 46 are screw threadedly mounted on the lower portion 45aof the rod 45 respectively above and below the arm 44 so that upwardmovement of the arm 44 will be transmitted to the rod 45 through theupper one of the nuts 46. The upper portion of the rod 45 extendsthrough an apertured forwardly disposed portion of the insulating plate33. Ata point normally somewhat below the plate 33 an enlargement 45h isformed on the rod 45 to constitute a collar or plate engaging element.After the assembling elevator 8 has reached its upper limit of movementcertain operations of the machine L take place responsive to theassembling elevator reaching its upper limit of movement, and suchoperations of the machine L are accompanied by counter-clockwiserotation of the line delivery shaft I0 through a moderate angle. Suchmovement of the line delivery shaft Ii) causes lifting of the arm 44 andthe rod 45. As movement of the shaft I0 progresses the collar`45b comesinto engagement with the plate 33 and lifting of the plate 33 occurs asa result of the further movement of the shaft I 0. As the plate 33reaches its raised position the dog 31, which has been engaged with theforward side of the stop element 35a under pressure of ythe spring 38,will be pulled by the spring'38 into en gagement with the lower side ofthe stop element 35a to maintain the plate 33 `in a raised positionuntil such .time asthe electromagneticcoil 4I `is again energized.

' From the above lit is seen'that my mechanism is capable* of .utilizingmechanical power to raise the assembling elevator 8 responsive tomanipulation of. an easily operated electrical switching key 43,

and rthat after application of lifting effort to the .assemblingelevator has' been initiated by the key l 43, such lifting effort isterminated automatically in response to Aoperationof the type-castingmachine L-at a suitable predetermined point in the cycle of operation ofthe type-castingzmachine L.

Obviously zwith my mechanism placed in operative association with amachine such as the machine-L, the assembling elevator lever handle IImay be removed and hence the obstruction constituted by the handle I Imay be eliminated.

It is apparent that I have invented a novel, compact,and-eifectivelifting mechanism for the assembling elevator of a type-casting machineconvenient electricall control thereof.

While my mechanism has been illustrated and described. as applied to aparticular type of typecaStingmachine, it should be apparent that themechanism is readily adapted for use in connection with other types oftype-casting machines and also withmany machines other than typecastingmachines.

It will, of course, be understood that various changes may be kmadeinvtheform, details, arrangementand proportionsl of the various partswithout departing from the scope of my invention.

What is claimed is:

1. In combination witha type-casting machine having a vertically movableassembling elevator, power-operated means for vertically moving saidelevator including, a rotatable operating shaft,

a rotatable body of magnetic material disposed co-axially of said shaftand adapted to be connected to a source of rotary mechanical power, anelectromagnet mounted on said operating shaft closely adjacent said/bodyand adapted, whenV energized, to adhere to said body to frictionallyconnect the same to said shaft, mechanism driven by said operating shaftto apply lifting eifort to'said elevator, an electrical contact elementconnected to said electromagnet, a vertically movable memberabove saidelement, a second-electrical Acontact element Ymounted on said memberand adapted for engagement with said rstmentioned contact elementtothere- -with comprise a switch, said switch being connected inserieswith said electromagnet, releasable Ameans normally supporting saidmember in raised position lto maintain said switch open, means manuallyactuatable to release said supporting means to effect closure of saidswitch, and means operating responsive to movement of said elevator tcraise said member vwhen said machine hasreached apredetermined point inits cycle of operation, said supporting means being constructed toresume support of saidmember when Vsaid member has. been placed in araised position thereof.

' 2; In combination witha type-casting machine having a vertically`movable assembling elevator, power-operated means for moving lsaidelevator including, a` rotatable operating shaft, an .electromagneticclutch associated with said shaft and adapted Vfor frictionallyconnecting the same .t0 a source of rotarymechanical power, mechanismdriven by said operating shaft to apply :lifting effort to -saidelevator, 1an:annular.electric cur- `and'that my mechanism is adaptedfor easy and y rent collector insulatedly mounted on said operatingshaft and electrically connected to said electromagnetic clutch, avertically' movable member above said collector, an electrical contactelement carried by said member and adapted for engagement withsaidcollector and connection to a source of electrical energy, releasablemeans normally retaining said member in raised position to maintain saidcontact element out of engagement with said collector, manuallyactuatablemeans for releasing said retaining means to permit dropping ofsaid member, and means operating responsive to movement of said elevatorto raise said member when said machine has reached a predetermined pointin its cycle of operation, said retaining means being constructed toresume its retaining position when said member has reached ar-aisedposition thereof.

3. In combination with a type-casting machine having a verticallymovable assembling elevator, power-operated means for vertically movingsaid elevator including a rotatable operating shaft,

ka rotatable body of magnetic material disposed ing effort to saidelevator, an annular electric current collector insulatedly mounted onsaid operating shaft and connected to said electroma-gnet,

a vertically movable member above said collector, an electrical contactelement carried by said member and adapted for engagement with saidcollector and to be connected to a source of electrical energy,releasable means normally retaining said member in raised position toprevent engagement of said element with said collector, manuallyactuatable means for releasing said retaining means to permit droppingof said member, and means operating responsive to movement of saidelevator to raise said member when said machine has reached apredetermined point in its cycle of operation, said retaining meansbeing constructed to resume a retaining position thereof when saidmember has reached a raised position thereof.

4. In combination with a type-casting machine having a verticallymovable assembling elevator, power operated means for moving saidelevator including, a rotatable operating shaft, an electromagneticclutch associated with said shaft and adapted to frictionally connectthe same to a source of rotary mechanical power for transmission ofmechanical power therebetween, mechanism driven by said operating shaftto apply lifting effort to said elevator, electrical switching meansadapted for use in controlling energization of said electromagneticclutch, a vertically shiftablemember for controlling said switchingmeans and arranged to be respectively lowered and raised to close andopen said switching means, releasable means normally holding said memberin its raised position, manually actuatable means for releasing saidholding means to permit dropping of said member, and means operatingresponsive to movement of said elevator to raise said member when saidmachine has reached a predetermined point in its cycle of operation,said holding means being constructed to resume its holding conditionwhen said member has reached its raised position. 5. In combination witha type-casting machine having a vertically movable assembling elevator,power-operated means for moving said elevator including, a rotatableoperating shaft, an electromagnetic clutch associated with said shaftand adapted for frictionally connecting the same to a source of rotarymechanical power for transmission of mechanical power therebetween,mechanism driven by said operating shaft to apply lifting effort to saidelevator, electrical switching means adapted for use in controllingenergization of said electromagnetic clutch, a vertically shiftablemember for controlling said Y switching means and arranged to belowered'and raised to respectively close and open said switching means,releasable means normally holding said member in its raised position,manually remote controlled electromagnetic means for releasing saidholding means to permit dropping of said member, and `mechanism operatedin response to movement of said elevator to raise said member when saidmachine has reached a predetermined point Yin its cycle of operation,said holding means being constructed to resume its holding conditionwhen said member has reached its raised position.

6. In combination with a type-casting machine having a verticallymovable assembling elevator, power-operated means for moving saidelevator including, a rotatable operating shaft, an electromagneticclutch associated with said shaft and adapted for frictionallyconnecting the same to a source of rotary mechanical power fortransmission of mechanical power therebetween, mechanism driven by saidoperating shaft to apply lifting effort to said elevator, electricalswitchr ing means adapted for use in controlling energization of saidelectromagnetic clutch, a vertically shiftable member for operating saidswitching means arranged to close and open said switching means whenrespectively lowered and raised,

a stop element on said member, a dog normally engaging said stop elementto hold said member in its raised position, electromagnetic means forshifting said dog out of engagement with said stop element to permitdropping of said member, manually controllable means for electricallyenergizing said electromagnetic means, mechanism operated in response tomovement of said elevator to raise said member when said machine hasreached a predetermined point in its cycle of operation, and resilientmeans urging said dog toward its position of engagement with said stopelement.

7. In combination with a type-casting machine having a verticallymovable assembling elevator, power-operated means for'moving saidelevator including, a rotatable operating shaft, Va clutch associatedwith said shaft and adapted for frictionally connecting the same to asource of rotaryvmechanical power for transmission of mechanical powertherebetween, manually controllable means for effecting engagement ofsaid clutch, a sprocket on said operating shaft,a sprocket chain trainedover said sprocket, means connecting said elevator to said chain forraising of said elevator responsive to engagement of said clutch, andmechanism operating responsive to upward movement of said elevator foreffecting disengagement of said clutch when said machine has reached apredetermined point in its cycle of opl eration.

8. Incombination with a type-casting machine having a vertically movableassembling elevator, power-operated means for moving said elevatorincluding, a rotatable operating shaft, a clutch 75 associated with saidshaft and adapted for frictionally connecting the same to a source ofrotary mechanical power for transmission of mechanical powertherebetween, manually controllable means for effecting engagement ofsaid clutch, a sprocket on said operating shaft, a second sprocketarranged to rotate about an axis parallel to and vertically spaced fromsaid operating shaft, an endless sprocket chain trained over saidsprockets, means connecting said elevator to the run of said chain whichrises responsive to engagement of said clutch, and mechanism operatingresponsive to upward movement of said elevator for effectingdisengagement of said clutch when said machine has reached apredetermined point in its cycle of operation.

9. In combination With a keyboard-operated type-casting machine having avertically movable assembling elevator, a line delivery rock shaft, anda continuously rotating cam-roll shaft, electrically controllable meansfor vertically moving said elevator including, an operating shaftrotatably supported in axial alignment with said roll shaft, a body ofmagnetic material mounted on the end of said roll shaft adjoining saidoperating shaft, an electromagnet mounted on said operating shaftclosely adjacent to said body and adapted, when energized, to adhere tosaid body for frictional transmission of rotary power from said rollshaft to said operating shaft, a sprocket on said operating shaft and asecond sprocket therebelow mounted for rotation about an axis parallelthereto, an endless sprocket chain trained over said sprockets andhaving one run thereof connected to said elevator for raising the sameresponsive to rotation of said operating shaft, a slip-ring insulatedlymounted on said operating shaft and electrically connected to saidelectromagnet, a vertically movable member above said slip-ring, anelectrical contact element on said member adapted for engagement Withsaid slipring, a source of electrical energy for said electromagnetconnected to said element, a stop element on said member, aspring-pressed dog normally engaging said stop to hold said contactelement out of engagement with said slip-ring, electromagnetic means forshifting said dog out of engagement with said stop element to permitengagement of said contact element with said slipring to energize saidelectromagnet, manually operatable means for energizing saidelectromagnetic means, a generally horizontally projecting arm on saidrock shaft arranged to swing upwardly responsive to rocking of said rockshaft in response to upward movement of said elevator, a verticallyextending elongated element swingably connected at its lower end to thefree end of said arm, said member having an aperture therethrough andthe upper portion of said elongated element being extended through saidaperture, and an element formed on said elongated element at a pointnormally spaced below said member and adapted to engage and lift saidmember to disengage said contact element from said slipring and enableengagement of said dog with said stop after said elevator has reachedthe upper limit of the desired range of movement thereof whereupon saidelevator may descend in response to the pull of gravity.

10. In combination with a type-casting machine having an assemblingelevator vertically movable between limits, power-operated means forlifting said elevator including, normally inoperative apparatus forapplying lifting eiort to said elevator, manually controllable means forrendering said apparatus operative, frictional means interposed in saidapparatus to slip and yet maintain lifting effort on said elevator afterthe same has reached its upper limit of movement, and mechanismoperating responsive to reaching by said elevator of said upper limit torender said apparatus inoperative when said machine has reached apredetermined point in its cycle of operation subsequent by apredetermined length of time to reaching by said elevator of said upperlimit.

11. In combination with a type-casting machine having an assemblingelevator vertically movable between limits, power-operated means forlifting said elevator including, means for applying lifting effort tosaid elevator, a rotary element connected to said means for driving thesame in a lifting operation thereof, means for rotating said elementrenderable operative manually, frictional means interposed between saidshaft and said lifting means to slip and yet maintain lifting effort onsaid elevator after the same has reached its upper limit of movement,and means operating automatically to render said r0- tating meansinoperative responsive to and at a predetermined length of time afterreaching by said elevator of its upper limit of movement.

12. In combination with a type-casting machine having an assemblingelevator vertically movable between limits and the usual line deliveryshaft, power-operated means for lifting said elevator including, meansfor applying lifting effort to said elevator, a rotary element connectedto said means for driving the same in a lifting operation thereof, meansfor rotating said element renderable operative manually, and meansconnected to said line delivery shaft to be operated responsive torotation thereof to render said rotating means inoperative at apredetermined time after said elevator has reached its upper limit ofmovement.

RALPH V. STREETER.

